Which of the following is NOT typically involved in a fire investigation?

In a fire investigation, the main focus is on understanding the cause and origin of the fire, along with gathering relevant evidence to support conclusions. Key components include determining how and why the fire started, analyzing eyewitness accounts for additional context, and documenting physical evidence of where the fire began.

Assessing fire department response times, while important for overall fire service efficiency and community safety, does not directly pertain to the specifics of a fire investigation itself. Instead, it falls more under the realm of departmental review and evaluation of operational effectiveness. This aspect may be useful for logistical improvements or future fire prevention strategies, but it does not contribute to the investigation of a specific incident's origin or cause. Hence, it is the element that is not typically involved in the immediate process of a fire investigation.